Data Libraries

• UCI Machine Learning Repository
• UCI KDD Archive UCI Knowledge Discovery in Databases Archive
• UW XML Repository University of Washington XML Data Repository
• StatLib Data, Software and News from the Statistics Community
• Time Series Analysis and Its Applications Book Example Data
• Time Series Data Library
• TimeWeb Web-based time series databanks
• PKDD 2000 Challenge Challenges of European Conferences on Principles and Practice of Knowledge Discovery in Databases
• PhysioNet the research resource for complex physiologic signals
• MatrixMarket A visual repository of test data for use in comparative studies of algorithms for numerical linear algebra, featuring nearly 500 sparse matrices from a variety of applications, as well as matrix generation tools and services.
• LifeLine project Visualising Migrations, Transitions and Trajectories
• 10x10 Every hour, 10x10 gathers the 100 most important words and pictures in the world, based on what's happening in the news.
• InfoVis Cyberinfrastructure Data Bases
• Enron Email Dataset
• Historical Stock Data Historical Data for S&P 500 Stocks
• Ensembl Provides sequence databases of gene, transcript and protein predictions.
• EPA air quality AirData Web site gives you access to air pollution data for the entire United States.
• Network intrusion dataset
• Internet Backbone Data Internet Mapping Project
• UCR Time Series Data Mining Archive A resource for researchers interested in the clustering, classification, indexing, segmentation, change point detection and rule extraction of time series. (by Eamonn Keogh)

InfoVis Contest Datasets

• InfoVis 2003 Contest Tree data
• InfoVis 2004 Contest Meta Data of publications
• InfoVis 2005 Contest Technology Trends in the United States
• InfoVis 2006 Contest 1% public use microdata sample from the 2002 Census

Other Lists

• Jeff Klingner's List of Online Databases